Process of making speckled-enameled ware and the product thereof.



, dry process.

- UNITED STATES;

-.WALTER J. KOHLER, or SHEBOYGAN, WISCONSIN, Asslenon TO J. M.

PATENT oFFioE.

KOHLER SONS COMPANY, OF SHEBOYGAN, W1SOONSIN, A CORPORA- "TION OF WISCONSIN.

- PROCESS OF MAKING SPECKLED-ENAMELED WAIiE AND THE RRODUCT THEREOF.

To all whom, it may concern;

Be it known that I, WALTER J KoHLER, residingin Sheboygan, in the county of Sheboygan and State of Wisconsin, have invented a new and useful Process of Making Speckled- Enameled Ware and the Product Thereof, of which the following is a specification.

My invention relates .to a new and useful method of manufacturing a variegated porcelain enamel to-be applied on metallic surfaces by the dry process.

In order to properly explain my invention, I will first describe in detail the two at present popular and separate and distinctmethods of enameling metallic surfaces known, respectively, as the wet process and the The wet process, to which my invention does not appertain. consists, generally speaking, of an enamel of a'suitable raw material composition which has been properly mixed and melted and to which has been added water and a small percentage of clay or other material having same effect, and grinding or pulverizing this mixture to a more or less degree of fineness, so that it has approximately the consistency of cream, although this is not absolutely necessary. The

I enamel can also be pulverizeddry and then have added" thereto the water and clay and mixing same thoroughly by hand. This so prepared enamel is then applied in liquid or paste form on the metallic article by pouring the enamel over the article or by dippingthe article into the enamel and shaking off surplus enamel, (which operation is commonly known as lining, dippingfor ing,) the said article having been previously cleaned by any method, such as pickling and scouring, sand-blasting, or otherwise. After the article is so coated it is placed in dryingroom or ondry-oven until the moisture in the enamel is evaporated, and the article is then subjected to a high temperature in a mufiie or other furnace, the heat causing the coat of.

enamel to fuse onto the metal, when thearticle is withdrawn and allowed to cool, leaving a hard glassy surface. This operation of coating and firing can be repeated several times, if desired, though it is not always necessary. The dry process, to which my invention does appertain, consists of a porcelain enamel of a suitable raw-material composition Specification of Letters Patent. Application filed September 22, 1904.. Serial No. 226,315.

slush- Patented Dec. 5, 1905.

which has been properly mixed, melted, and dried and while in a dry state is ground or pulverized. This porcelain enamel is then turned to the furnace and fusing operation completed. If one coat of sifted powdered porcelain enamel does not bring about the desired result of opacity, uniformity, &c., the operation of sifting the powder porcelain enamel and fusing'same can be repeated several times.

I will now explain my invention for the producing of a variegated speckled-porcelain enamel by the dry process and which I claim a as new and original.

I take as a base a one -,color porcelain enamel, (white or any other color,) of suitable raw-material composition which has been properly mixed, melted, and pulverized n dry form and which is ready and complete 1n itself for applying to the heated metallic surfaces and add-thereto and mix thoroughly with same a certain quantity of granulated or pulverized material, not enamel, of a contrasting color, which will not fuse at the same temperature as the body of the enamel, and I then apply this combined enamel mixture by sifting same dry upon a highly-heated metal lic article which has been previously cleaned by any method and coated with a foundation or ground coat, if desired, and fusing same thereon, producing a beautifully variegated speckled effect.

This method of producing a variegated porcelain enamel-by the dry process is particularly adapted to the manufacture of cast' 2. A new article of manufacture of metal enameled ware, the enamel coating of which has been made by the dry process and is composed of fused enameling material of one color and comminuted non-fused carborundum of a different color mixed in the enameling material while in pulverized condition and before the enamel was fused on the metal.

In testimony whereof I afiix my signature in presence of two witnesses.

WALTER J. KOHLER.

Witnesses:

A. G. KRoos, O. A. Knoos. 

